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Document Type and Number:
Japanese Patent JPS527910
Kind Code:
Y2
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Application Number:
JP11701872U
Publication Date:
February 18, 1977
Filing Date:
October 05, 1972
Export Citation:
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International Classes:
E21B44/00; B25D9/00; E21B1/00; (IPC1-7): B25D9/00



 
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